Heres the amp in question:

http://www.marantz.com/new/index.cfm...f&prod_id=3519
Owners Manual
Product Information Sheet
Im assuming you have the RCA Cable connected to Aux/DVD.

If not do it.

How long is the RCA Cable?

The shorter it is the better the sound quality.

Long cables can pick up a lot of interference.

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@Neon

The RMS value in the manual claims to be 40/55w @ 8Ω/4Ω.

Thats about 10/13 watts per channel right?

Since there are 4 channels.

The speakers as he stated earlier are rated 50W each and are compatible with amps that have 10-100 Watts per channel.

So they trully need 100 watts each to reach their full potentional.

100w being the max value right? and 50 being the RMS?

I think the amp isnt powerful enough, a 200-400w RMS amp is what would be perfect i think.

Thats if it had 4 outputs like the marantz.

Otherwise youre looking at 2 100w-200w stereo amps.